Rotary pump



G. P. DORR.

ROTARY PUMP.

APPLICATION FILED Aue.4. 1919.

Patented Dec. 2,1919. 2 SHEETSSHEET l.

l(i. P. DORR.

ROTARY PUMP.

APPLICATION FILED Aus..4. 1919.

Patented l Deo. 2, 1919.

2 SHEETS-SHEET 2- \\IIIIIIIIIIII UmfrEDl s'rA'rEs PArE GEORGE P. BORR, F CHICAGO, ILLINOIS.

ROTARY PUMP.

Specification -of Letters Patent. V

Application led August 4, 1919. Serial No. 315,141.

1b all 'whom it may concern.'

)Be it known that I, GEORGE P. oRR, a citizen of the United States, resi ing at Chicago, c'ounty of Cook, State of Illinois,

t have invented a certain new and useful Improvement in Rotary Pumps, and declare `the following to be a full, clear, and exact the pressure'or suction is produced by the` -action of intermeshing gears m-ounted in a closely fitting housing. The only way in which sccessful operationmay be obtained and leakage loss avoided is to grind the.

gears and the housings so as to produce -an extremely accurate fit. This is not only expensive `as to-initial cost but, since wear begins to take place as soon as a machine is set in operation, the nice initial adjustment cannot be maintained andthe efciency soon decreases rapidly. The objectof the present invention is to produce aumpof the rotary gear type which shall be simple to manufacture in such'a manner as to bring about the requisite accuracy of fit to secure a high degree of eiiiciency in operation, and which will automatically maintain itself in a con-V dition which will insure continued efiiciency. The various features of novelty whereby my invention i/s characterized will hereinafter be pointed out with particularity in the claims; but, fora full understandingof my invention and of its object and advantages, reference may Ibe-hadto the following detailed description taken in connection with the accompanying drawings, wherein: Figure y1 is a horizontal axial section throu h a pump arranged in accordance with t e preferred form of my invention;

Fig-2 is an end view looking at the right .i hand end of. Fig. 1; v Fig. 3 is a section taken approximately on line 3-3 7of Fig. 1;

Fig. 4 is aview similar vto Fig. 2 showing]l the 'opposite 'end of the device; and;

Fig. 5 is a side elevation of the pump on a greatly reducedscale, mounted 1n an oil chamber which is shown in section.

Referring -to the drawings, 1 represents a gear casing containing two pockets or chambers, 2 and 3, arranged at a slight angle to each other and merging together at.

their inner ends. The outer portions of the chambers 2 and 3 may be cylindrical, but the inner portions, as indicated at 4, 4, are in theform of frustums of cones. 6 and 7 represent gear wheels elongated in the axial direction, each shaped so'that at one end it fits accurately into one of the conical .por-

'rammed nec. a, rara.

tions, 4, ofthe gear chambers, while at its i,

other end it fits into the adjacent cylindrical portion of the corresponding chamber. The gears are fixed upon shafts, 8 and 9, coaxial therewith. The shaft 8 terminates in a suitable bearing in a plug, 10, closing the outer end of the chamber 2` while the shaft 9'extends out-through a suitable gland, 11,'and

'stuihng box, 12, beyond the` chamber 3 and forms the driving member forl the pump.

Each of the gear chambers asa Wihole is made considerably longer than the corresponding gear so as to provide room forla Vcom-pression spring, 13, in the chamber beyond the outer end of the gear. In the arrangement shown, each gear seats itself at its smaller end against the innerend of its chamber, the spring exerting-la pressure in the direction tending to force the gear fartherinto the chamber. In the5 arrangement shown, there are roller bearings, 14, in the members 10 and ,11, for the shafts 8.and 9 respectively; while, at the outer end of each gear may be placed a suitable ball bearing or roller bearing, 15, in order that each shaft ma have two anti-friction bearin s. he inlet to the ump is throng a passage, 16, which lea s to the interior of lone of the gear chambers, namely the gear chamber 3 at a'poi'nt or along a linecorresponding to a tooth in the gear member 4 which is about ready to--come into mesh with the coperating gear. Consequently the' valley between two adjacent teeth will be filled with the fluid to be pumped, and as a tooth 4 on the coperating ea'r enters the valley, it compresses the duid. By making the gear teeth 17 spiral,'as illustrated, an eifect is produced similary to that -in the ordinary herring-bone typeI ump namely: The fluid forced lengthwise, in this instance toward the smallerends of the gears. Therefore, b leading a discharge port, A18, out' of the c osed end of the gear casing from a point lying approximately ina plane containing the axes ofthe two shafts, the fluid to be pumped can ibo discharged from the gear lconfined in the va ley under consideration lis not only compressed but' is l. gradually cal gears into Atheir respective chambers is a comparatively simple matter and, because the springs are constantly tending to force the gearsV farther into the conical ends ofb the chambers, the gears will soon fit themselves securely into their seats if the lit happens to be,slightly imperfect at the beginnlng; and, as wear takes place, the springs will g automatically adjust the gears so as to mainl tending to force them ing an intake tain them properly -fitted into their seats.

The teeth of the gears preferably terminate in thel conical portion of the gears so that each gear will'have a part, 20, more orless .conical and with an uninterrupted surface nearits larger end adapted togrind itselfa seat and produce a tight joint as between a valve and the seat. Thus all danger of leakage past the large ends of the gears is avoided.

1. pump com rising a arcasin pravided with chamliiars arrand at avgslight angle to eachother and merging into each other at one end, each of said chambers belng in the form of a frustum of a cone at said end, intermeshing,

frusto-conical gears fitting in said frusto-conical ends, means yieldingly pressing-said gears axially in the direction to move them toward the smaller ends of said chambers, and said casing hav'-l port on one side of the plane containing the axes of the gears and a discharge port in the vicinity of the smaller ends of the gears.

2.'A pump .comprising a casing containing'two gear chambers, each chamber conand a frustoc onical portion having its larger end con,

t guous to the cylindrical portion, said chambers bein .arranged at a rslight angle to each other an merging slightly into each other throughout their respective truste-conical portions, intermeshing gears fitted in said chambers and each comprisinga frusto-conical portion and a cylindrical portion, means for maintaining on the gears a pressure smaller ends of said chambers, having an inlctport at one side of a plane containing the axes of the gears,

and an outshafts on which said in the direction of the A said casing tion, smallest at the closed end and a cylindrical portionadjacent toi-the frusta-conical portion., said chambers'being arranged at a slight angle to each other' and merging slightly into each other throughout their frusto-conical ortions, gears arranged within said cham ers and meshing with each other, each gear having a cylindrical outer portion and a frusto-conical inner .y ortion,

4. In a pump a caslng having elongated means for rotating saidgears, sai casing having inlet and outlet ports suitably located i to permit the gears to pump riiuids.

chambers. extending inwardly from one side thereof and closed atl their inner ends, said chambers being arranged at a slight angle to each other and each having an inner frusto-conical portion merginginto the correspending portion of the other chamber, frusto-conical intermeshing gears fitting in the frusto-conical portions of said chambers and engaging with the walls formingthe closures for the inner ends of said' chambers,

gears are mounted, closures for the outer ends'of said chambers having bearings for said shaftsLsaid casing having suitable inlet and outlet ports communicating with said chambers.

5. In a pump, a casing having elongated chambers extending inwardly'from onefside thereof and closed at their .inner ends, said chambers being arrangednat a slight angle to each other and each-havi g an inner frustoconical portion merg'in ing' portion of the ot cgnical intermeshing gears fitting in the frusto-conical portions of said chambers and.J engaging withl the walls forming the closures' for the inner ends of said chambers, Shafts sures for vthe outer ends of said chambers having bearings for said shafts,and springs in said chambers between the outer ends of the gears and the closures for the Outer ends er chamber, frustolof sa1d chambers, said casingl having suitable inlet and outlet portskcommunicatingl with said chambers. s

6. Av pump of the rotary intermeshing into the correspondon which said gears are mounted, clo- .l

gear type havingl` gears in the form of frustums pf cones. fitting into correspondingly shaped gear-chambers, and means tending to press said gears in the direction of the 'smaller ends of said chambers. l

In testimonynwhereof, I sign this specifcation.

-- GEORGE B. DORR. 

